The climatic signal in varved sediments from Lake C2, northern Ellesmere Island, Canada
Identifieur interne : 001A33 ( Istex/Corpus ); précédent : 001A32; suivant : 001A34The climatic signal in varved sediments from Lake C2, northern Ellesmere Island, Canada
Auteurs : Douglas R. Hardy ; Raymond S. Bradley ; Bernd ZolitschkaSource :
- Journal of Paleolimnology [ 0921-2728 ] ; 1996-09-01.
Abstract
Abstract: Annually-laminated clastic sediments preserve a high resolution proxy record of paleoclimate, provided that allochthonous sedimentation represents a response to meteorological forcing of watershed sediment transfer. Here, we demonstrate this linkage, and illustrate a calibration process using the most recent 40 years of a varve record from Lake C2 (82°50′ N; 78°00′ W), three years of field measurements, and meteorological data for 1951–92 from nearby AES weather station Alert. Field measurements were used to correlate proxies of the energy available for snowmelt (e.g. air temperature) and daily suspended sediment discharge (SSQ). Our calibration was extended through use of weather data from Alert. Both mean daily air temperature at Echo, and daily SSQ, were well correlated with air temperature at 600 m above Alert, as obtained from the 1200 Z (0800 LST) rawinsonde sounding. Accordingly, we used pooled 1990 and 1992 Alert 600 m data to predict the lagged daily sediment discharge into Lake C2 (adj. r 2=0.43). Daily values were summed each year in order to produce an annual series of predicted sediment transfer to the lake. The original varve chronology was based on eight sediment cores recovered from the deep basin of the lake (>80 m). Although low-frequency fluctuations of the varve and predicted SSQ series agree, slight tuning of the varve record optimizes the correlation between them. Adjustments were based on examination of weather data for specific years, reexamination of sediment core thin sections, and by aligning fluctuations in the two series which closely matched. Although the original chronology is reasonably well correlated with 600 m temperatures at Alert (for JJA mean, r=0.41, significant at 0.01), the adjusted chronology is both better correlated and contains a more precise climate signal (r=0.54 for July mean, significant at 0.01). This is the first calibrated varve record produced from Arctic lake sediments, and demonstrates that varves from Lake C2 contain a paleoclimatic record. We believe the post-facto manipulations required to produce the adjusted varve chronology are reasonable given the uncertainties inherent in varve counting, and the lack of any independent corroborating chronostratigraphic markers.
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DOI: 10.1007/BF00176938
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Bradley</name><affiliation><mods:affiliation>Dept. of Geosciences, University of Massachusetts, 01003, Amherst, MA, USA</mods:affiliation></affiliation></author><author><name sortKey="Zolitschka, Bernd" sort="Zolitschka, Bernd" uniqKey="Zolitschka B" first="Bernd" last="Zolitschka">Bernd Zolitschka</name><affiliation><mods:affiliation>Geology Department, Trier University, Trier, Germany</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Journal of Paleolimnology</title><title level="j" type="abbrev">J Paleolimnol</title><idno type="ISSN">0921-2728</idno><idno type="eISSN">1573-0417</idno><imprint><publisher>Kluwer Academic Publishers; http://www.wkap.nl/</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1996-09-01">1996-09-01</date><biblScope unit="volume">16</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="227">227</biblScope><biblScope unit="page" to="238">238</biblScope></imprint><idno type="ISSN">0921-2728</idno></series><idno type="istex">57693812323C50EF76A7F60F10AADD7808FCA715</idno><idno type="DOI">10.1007/BF00176938</idno><idno type="ArticleID">BF00176938</idno><idno type="ArticleID">Art9</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0921-2728</idno></seriesStmt></fileDesc><profileDesc><textClass></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Abstract: Annually-laminated clastic sediments preserve a high resolution proxy record of paleoclimate, provided that allochthonous sedimentation represents a response to meteorological forcing of watershed sediment transfer. Here, we demonstrate this linkage, and illustrate a calibration process using the most recent 40 years of a varve record from Lake C2 (82°50′ N; 78°00′ W), three years of field measurements, and meteorological data for 1951–92 from nearby AES weather station Alert. Field measurements were used to correlate proxies of the energy available for snowmelt (e.g. air temperature) and daily suspended sediment discharge (SSQ). Our calibration was extended through use of weather data from Alert. Both mean daily air temperature at Echo, and daily SSQ, were well correlated with air temperature at 600 m above Alert, as obtained from the 1200 Z (0800 LST) rawinsonde sounding. Accordingly, we used pooled 1990 and 1992 Alert 600 m data to predict the lagged daily sediment discharge into Lake C2 (adj. r 2=0.43). Daily values were summed each year in order to produce an annual series of predicted sediment transfer to the lake. The original varve chronology was based on eight sediment cores recovered from the deep basin of the lake (>80 m). Although low-frequency fluctuations of the varve and predicted SSQ series agree, slight tuning of the varve record optimizes the correlation between them. Adjustments were based on examination of weather data for specific years, reexamination of sediment core thin sections, and by aligning fluctuations in the two series which closely matched. Although the original chronology is reasonably well correlated with 600 m temperatures at Alert (for JJA mean, r=0.41, significant at 0.01), the adjusted chronology is both better correlated and contains a more precise climate signal (r=0.54 for July mean, significant at 0.01). This is the first calibrated varve record produced from Arctic lake sediments, and demonstrates that varves from Lake C2 contain a paleoclimatic record. We believe the post-facto manipulations required to produce the adjusted varve chronology are reasonable given the uncertainties inherent in varve counting, and the lack of any independent corroborating chronostratigraphic markers.</div></front></TEI><istex><corpusName>springer</corpusName><author><json:item><name>Douglas R. Hardy</name><affiliations><json:string>Dept. of Geosciences, University of Massachusetts, 01003, Amherst, MA, USA</json:string></affiliations></json:item><json:item><name>Raymond S. Bradley</name><affiliations><json:string>Dept. of Geosciences, University of Massachusetts, 01003, Amherst, MA, USA</json:string></affiliations></json:item><json:item><name>Bernd Zolitschka</name><affiliations><json:string>Geology Department, Trier University, Trier, Germany</json:string></affiliations></json:item></author><articleId><json:string>BF00176938</json:string><json:string>Art9</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>OriginalPaper</json:string></originalGenre><abstract>Abstract: Annually-laminated clastic sediments preserve a high resolution proxy record of paleoclimate, provided that allochthonous sedimentation represents a response to meteorological forcing of watershed sediment transfer. Here, we demonstrate this linkage, and illustrate a calibration process using the most recent 40 years of a varve record from Lake C2 (82°50′ N; 78°00′ W), three years of field measurements, and meteorological data for 1951–92 from nearby AES weather station Alert. Field measurements were used to correlate proxies of the energy available for snowmelt (e.g. air temperature) and daily suspended sediment discharge (SSQ). Our calibration was extended through use of weather data from Alert. Both mean daily air temperature at Echo, and daily SSQ, were well correlated with air temperature at 600 m above Alert, as obtained from the 1200 Z (0800 LST) rawinsonde sounding. Accordingly, we used pooled 1990 and 1992 Alert 600 m data to predict the lagged daily sediment discharge into Lake C2 (adj. r 2=0.43). Daily values were summed each year in order to produce an annual series of predicted sediment transfer to the lake. The original varve chronology was based on eight sediment cores recovered from the deep basin of the lake (>80 m). Although low-frequency fluctuations of the varve and predicted SSQ series agree, slight tuning of the varve record optimizes the correlation between them. Adjustments were based on examination of weather data for specific years, reexamination of sediment core thin sections, and by aligning fluctuations in the two series which closely matched. Although the original chronology is reasonably well correlated with 600 m temperatures at Alert (for JJA mean, r=0.41, significant at 0.01), the adjusted chronology is both better correlated and contains a more precise climate signal (r=0.54 for July mean, significant at 0.01). This is the first calibrated varve record produced from Arctic lake sediments, and demonstrates that varves from Lake C2 contain a paleoclimatic record. We believe the post-facto manipulations required to produce the adjusted varve chronology are reasonable given the uncertainties inherent in varve counting, and the lack of any independent corroborating chronostratigraphic markers.</abstract><qualityIndicators><score>8</score><pdfVersion>1.3</pdfVersion><pdfPageSize>547.28 x 738 pts</pdfPageSize><refBibsNative>false</refBibsNative><keywordCount>0</keywordCount><abstractCharCount>2272</abstractCharCount><pdfWordCount>6293</pdfWordCount><pdfCharCount>32045</pdfCharCount><pdfPageCount>12</pdfPageCount><abstractWordCount>342</abstractWordCount></qualityIndicators><title>The climatic signal in varved sediments from Lake C2, northern Ellesmere Island, Canada</title><refBibs><json:item><author><json:item><name>R,S Bradley</name></json:item><json:item><name>M,J Retelle</name></json:item><json:item><name>S,D Ludlam</name></json:item><json:item><name>D,R Hardy</name></json:item><json:item><name>B Zolitschka</name></json:item><json:item><name>&,S F Lamoureux</name></json:item></author><host><volume>16</volume><pages><last>110</last><first>97</first></pages><author></author><title>J. Paleolimnol</title><publicationDate>1996</publicationDate></host><title>The Taconite Inlet Lakes Project: A systems approach to paleoclimatic reconstruction</title><publicationDate>1996</publicationDate></json:item><json:item><author><json:item><name>M Church</name></json:item></author><host><pages><last>229</last><first>205</first></pages><author></author><title>Flood geomorphology</title><publicationDate>1988</publicationDate></host><title>Floods in cold climates</title><publicationDate>1988</publicationDate></json:item><json:item><author><json:item><name>J,R Deslodges</name></json:item></author><host><volume>26</volume><pages><last>140</last><first>130</first></pages><author></author><title>Arc. Alp. Res</title><publicationDate>1994</publicationDate></host><title>Varve deposition and the sediment yield record at three small lakes of the southern Canadian Cordillera</title><publicationDate>1994</publicationDate></json:item><json:item><author><json:item><name>R Gilbert</name></json:item></author><host><volume>12</volume><pages><last>1711</last><first>1697</first></pages><author></author><title>Can. J. Earth Sci</title><publicationDate>1975</publicationDate></host><title>Sedimentation in Lillooet Lake, British Columbia</title><publicationDate>1975</publicationDate></json:item><json:item><author><json:item><name>L Granar</name></json:item></author><host><volume>78</volume><pages><last>658</last><first>654</first></pages><author></author><title>Geol. F6ren. F6rhandl</title><publicationDate>1956</publicationDate></host><title>Dating of recent fluvial sediments from the estuary of the .~ngerman river (The period 1850-1950 A.D.)</title><publicationDate>1956</publicationDate></json:item><json:item><author><json:item><name>D,R Hardy</name></json:item></author><host><volume>16</volume><pages><last>149</last><first>133</first></pages><author></author><title>Canada. J. Paleolimnol</title><publicationDate>1996</publicationDate></host><title>Climatic influences on streamflow and sediment flux into Lake C2, northern Ellesmere Island</title><publicationDate>1996</publicationDate></json:item><json:item><author><json:item><name>D,R Hardy</name></json:item></author><host><pages><first>267</first></pages><author></author><title>Canada . Ph.D. diss</title><publicationDate>1995</publicationDate></host><title>Streamflow and sediment transfer from a mountainous High Arctic watershed, northern Ellesmere Island</title><publicationDate>1995</publicationDate></json:item><json:item><author><json:item><name>G Hattersley-Smith</name></json:item><json:item><name>A,P Crary</name></json:item><json:item><name>&,R L Christie</name></json:item></author><host><volume>8</volume><pages><last>36</last><first>1</first></pages><author></author><title>Northern Ellesmere Island Arctic</title><publicationDate>1953</publicationDate></host><publicationDate>1953</publicationDate></json:item><json:item><author><json:item><name>S,F R S Lamoureux</name></json:item><json:item><name> Bradley</name></json:item></author><host><volume>16</volume><pages><last>255</last><first>239</first></pages><author></author><title>Canada. J. Paleolimnol</title><publicationDate>1996</publicationDate></host><title>A late Holocene varved sediment record of environmental change from northern Ellesmere Island</title><publicationDate>1996</publicationDate></json:item><json:item><author><json:item><name>A,F Leemann</name></json:item><json:item><name> Niessen</name></json:item></author><host><volume>4</volume><pages><last>8</last><first>1</first></pages><author></author><title>The Holocene</title><publicationDate>1994</publicationDate></host><title>Varve formation and the elimatie record in an Alpine proglacial lake: calibrating annuallylaminated sediments against hydrological and meteorological data</title><publicationDate>1994</publicationDate></json:item><json:item><author><json:item><name>E,M Leonard</name></json:item></author><host><volume>21</volume><pages><last>42</last><first>35</first></pages><author></author><title>Z. Gletsch. Glacizial</title><publicationDate>1985</publicationDate></host><title>Glaciological and climatic controls on lake sedimentation, Canadian Roeky Mountains</title><publicationDate>1985</publicationDate></json:item><json:item><author><json:item><name>M,J J Retelie</name></json:item><json:item><name> Child</name></json:item></author><host><volume>16</volume><pages><last>167</last><first>151</first></pages><author></author><title>Canada. J. Paleolimnol</title><publicationDate>1996</publicationDate></host><title>Suspended sediment transport and deposition in a High Arctic meromictic lake, northern Ellesmere Island</title><publicationDate>1996</publicationDate></json:item><json:item><author><json:item><name>B Zolitschka</name></json:item></author><host><volume>2</volume><pages><first>85</first></pages><author></author><title>Canada. NATO Science Fellowships Program, Final Report</title><publicationDate>1993</publicationDate></host><title>Sedimentation in nonglacial arctic lakes at Taconite Inlet, Ellesmere Island</title><publicationDate>1993</publicationDate></json:item><json:item><author><json:item><name>B Zolitschka</name></json:item></author><host><volume>16</volume><pages><last>186</last><first>169</first></pages><author></author><title>Canada. J. Paleolimnol</title><publicationDate>1996</publicationDate></host><title>Recent sedimentation in a High Arctic lake, northern Ellesmere Island</title><publicationDate>1996</publicationDate></json:item><json:item><host><author><json:item><name>B Zolitschka</name></json:item><json:item><name>S,F Lamoureux</name></json:item><json:item><name>&,R S </name></json:item></author><title>Bradley, in prep., Potential chronological errors in clastic varved sediments</title></host></json:item></refBibs><genre><json:string>research-article</json:string></genre><host><volume>16</volume><pages><last>238</last><first>227</first></pages><issn><json:string>0921-2728</json:string></issn><issue>2</issue><subject><json:item><value>Geochemistry</value></json:item><json:item><value>Hydrogeology</value></json:item><json:item><value>Meteorology/Climatology</value></json:item><json:item><value>Sedimentology</value></json:item><json:item><value>Hydrobiology</value></json:item></subject><journalId><json:string>10933</json:string></journalId><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1573-0417</json:string></eissn><title>Journal of Paleolimnology</title><publicationDate>1996</publicationDate><copyrightDate>1996</copyrightDate></host><categories><wos><json:string>science</json:string><json:string>limnology</json:string><json:string>geosciences, multidisciplinary</json:string><json:string>environmental sciences</json:string></wos><scienceMetrix><json:string>natural sciences</json:string><json:string>earth & environmental sciences</json:string><json:string>paleontology</json:string></scienceMetrix></categories><publicationDate>1996</publicationDate><copyrightDate>1996</copyrightDate><doi><json:string>10.1007/BF00176938</json:string></doi><id>57693812323C50EF76A7F60F10AADD7808FCA715</id><score>0.9902257</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/57693812323C50EF76A7F60F10AADD7808FCA715/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/57693812323C50EF76A7F60F10AADD7808FCA715/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/57693812323C50EF76A7F60F10AADD7808FCA715/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">The climatic signal in varved sediments from Lake C2, northern Ellesmere Island, Canada</title><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt><respStmt><resp>Références bibliographiques récupérées via GROBID</resp><name resp="ISTEX-API">ISTEX-API (INIST-CNRS)</name></respStmt></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>Kluwer Academic Publishers; 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http://www.wkap.nl/</publisher><pubPlace>Dordrecht</pubPlace><date type="published" when="1996-09-01"></date><biblScope unit="volume">16</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="227">227</biblScope><biblScope unit="page" to="238">238</biblScope></imprint></monogr><idno type="istex">57693812323C50EF76A7F60F10AADD7808FCA715</idno><idno type="DOI">10.1007/BF00176938</idno><idno type="ArticleID">BF00176938</idno><idno type="ArticleID">Art9</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1995-03-15</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>Abstract: Annually-laminated clastic sediments preserve a high resolution proxy record of paleoclimate, provided that allochthonous sedimentation represents a response to meteorological forcing of watershed sediment transfer. Here, we demonstrate this linkage, and illustrate a calibration process using the most recent 40 years of a varve record from Lake C2 (82°50′ N; 78°00′ W), three years of field measurements, and meteorological data for 1951–92 from nearby AES weather station Alert. Field measurements were used to correlate proxies of the energy available for snowmelt (e.g. air temperature) and daily suspended sediment discharge (SSQ). Our calibration was extended through use of weather data from Alert. Both mean daily air temperature at Echo, and daily SSQ, were well correlated with air temperature at 600 m above Alert, as obtained from the 1200 Z (0800 LST) rawinsonde sounding. Accordingly, we used pooled 1990 and 1992 Alert 600 m data to predict the lagged daily sediment discharge into Lake C2 (adj. r 2=0.43). Daily values were summed each year in order to produce an annual series of predicted sediment transfer to the lake. The original varve chronology was based on eight sediment cores recovered from the deep basin of the lake (>80 m). Although low-frequency fluctuations of the varve and predicted SSQ series agree, slight tuning of the varve record optimizes the correlation between them. Adjustments were based on examination of weather data for specific years, reexamination of sediment core thin sections, and by aligning fluctuations in the two series which closely matched. Although the original chronology is reasonably well correlated with 600 m temperatures at Alert (for JJA mean, r=0.41, significant at 0.01), the adjusted chronology is both better correlated and contains a more precise climate signal (r=0.54 for July mean, significant at 0.01). This is the first calibrated varve record produced from Arctic lake sediments, and demonstrates that varves from Lake C2 contain a paleoclimatic record. We believe the post-facto manipulations required to produce the adjusted varve chronology are reasonable given the uncertainties inherent in varve counting, and the lack of any independent corroborating chronostratigraphic markers.</p></abstract><textClass><keywords scheme="Journal Subject"><list><head>Life Sciences</head><item><term>Geochemistry</term></item><item><term>Hydrogeology</term></item><item><term>Meteorology/Climatology</term></item><item><term>Sedimentology</term></item><item><term>Hydrobiology</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1995-03-15">Created</change><change when="1996-09-01">Published</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2016-11-22">References added</change><change xml:id="refBibs-istex" who="#ISTEX-API" when="2017-01-20">References 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NumberingStyle="Unnumbered"><JournalID>10933</JournalID><JournalPrintISSN>0921-2728</JournalPrintISSN><JournalElectronicISSN>1573-0417</JournalElectronicISSN><JournalTitle>Journal of Paleolimnology</JournalTitle><JournalAbbreviatedTitle>J Paleolimnol</JournalAbbreviatedTitle><JournalSubjectGroup><JournalSubject Type="Primary">Life Sciences</JournalSubject><JournalSubject Type="Secondary">Geochemistry</JournalSubject><JournalSubject Type="Secondary">Hydrogeology</JournalSubject><JournalSubject Type="Secondary">Meteorology/Climatology</JournalSubject><JournalSubject Type="Secondary">Sedimentology</JournalSubject><JournalSubject Type="Secondary">Hydrobiology</JournalSubject></JournalSubjectGroup></JournalInfo><Volume><VolumeInfo VolumeType="Regular" TocLevels="0"><VolumeIDStart>16</VolumeIDStart><VolumeIDEnd>16</VolumeIDEnd><VolumeIssueCount>3</VolumeIssueCount></VolumeInfo><Issue IssueType="Regular"><IssueInfo TocLevels="0"><IssueIDStart>2</IssueIDStart><IssueIDEnd>2</IssueIDEnd><IssueArticleCount>10</IssueArticleCount><IssueHistory><CoverDate><Year>1996</Year><Month>9</Month></CoverDate></IssueHistory><IssueCopyright><CopyrightHolderName>Kluwer Academic Publishers</CopyrightHolderName><CopyrightYear>1996</CopyrightYear></IssueCopyright></IssueInfo><Article ID="Art9"><ArticleInfo Language="En" ArticleType="OriginalPaper" NumberingStyle="Unnumbered" TocLevels="0" ContainsESM="No"><ArticleID>BF00176938</ArticleID><ArticleDOI>10.1007/BF00176938</ArticleDOI><ArticleSequenceNumber>9</ArticleSequenceNumber><ArticleTitle Language="En">The climatic signal in varved sediments from Lake C2, northern Ellesmere Island, Canada</ArticleTitle><ArticleFirstPage>227</ArticleFirstPage><ArticleLastPage>238</ArticleLastPage><ArticleHistory><RegistrationDate><Year>2004</Year><Month>7</Month><Day>5</Day></RegistrationDate><Received><Year>1995</Year><Month>3</Month><Day>15</Day></Received><Accepted><Year>1995</Year><Month>8</Month><Day>28</Day></Accepted></ArticleHistory><ArticleCopyright><CopyrightHolderName>Kluwer Academic Publishers</CopyrightHolderName><CopyrightYear>1996</CopyrightYear></ArticleCopyright><ArticleGrants Type="Regular"><MetadataGrant Grant="OpenAccess"></MetadataGrant><AbstractGrant Grant="OpenAccess"></AbstractGrant><BodyPDFGrant Grant="Restricted"></BodyPDFGrant><BodyHTMLGrant Grant="Restricted"></BodyHTMLGrant><BibliographyGrant Grant="Restricted"></BibliographyGrant><ESMGrant Grant="Restricted"></ESMGrant></ArticleGrants><ArticleContext><JournalID>10933</JournalID><VolumeIDStart>16</VolumeIDStart><VolumeIDEnd>16</VolumeIDEnd><IssueIDStart>2</IssueIDStart><IssueIDEnd>2</IssueIDEnd><IssueTitle Language="En">Taconite Inlet Lakes Project</IssueTitle></ArticleContext></ArticleInfo><ArticleHeader><AuthorGroup><Author AffiliationIDS="Aff1"><AuthorName DisplayOrder="Western"><GivenName>Douglas</GivenName><GivenName>R.</GivenName><FamilyName>Hardy</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff1"><AuthorName DisplayOrder="Western"><GivenName>Raymond</GivenName><GivenName>S.</GivenName><FamilyName>Bradley</FamilyName></AuthorName></Author><Author AffiliationIDS="Aff2"><AuthorName DisplayOrder="Western"><GivenName>Bernd</GivenName><FamilyName>Zolitschka</FamilyName></AuthorName></Author><Affiliation ID="Aff1"><OrgDivision>Dept. of Geosciences</OrgDivision><OrgName>University of Massachusetts</OrgName><OrgAddress><Postcode>01003</Postcode><City>Amherst</City><State>MA</State><Country>USA</Country></OrgAddress></Affiliation><Affiliation ID="Aff2"><OrgDivision>Geology Department</OrgDivision><OrgName>Trier University</OrgName><OrgAddress><City>Trier</City><Country>Germany</Country></OrgAddress></Affiliation></AuthorGroup><Abstract ID="Abs1" Language="En"><Heading>Abstract</Heading><Para>Annually-laminated clastic sediments preserve a high resolution proxy record of paleoclimate, provided that allochthonous sedimentation represents a response to meteorological forcing of watershed sediment transfer. Here, we demonstrate this linkage, and illustrate a calibration process using the most recent 40 years of a varve record from Lake C2 (82°50′ N; 78°00′ W), three years of field measurements, and meteorological data for 1951–92 from nearby AES weather station Alert. Field measurements were used to correlate proxies of the energy available for snowmelt (e.g. air temperature) and daily suspended sediment discharge (SSQ). Our calibration was extended through use of weather data from Alert. Both mean daily air temperature at Echo, and daily SSQ, were well correlated with air temperature at 600 m above Alert, as obtained from the 1200 Z (0800 LST) rawinsonde sounding. Accordingly, we used pooled 1990 and 1992 Alert 600 m data to predict the lagged daily sediment discharge into Lake C2 (adj. <Emphasis Type="Italic">r</Emphasis><Superscript>2</Superscript>=0.43). Daily values were summed each year in order to produce an annual series of predicted sediment transfer to the lake. The original varve chronology was based on eight sediment cores recovered from the deep basin of the lake (>80 m). Although low-frequency fluctuations of the varve and predicted SSQ series agree, slight tuning of the varve record optimizes the correlation between them. Adjustments were based on examination of weather data for specific years, reexamination of sediment core thin sections, and by aligning fluctuations in the two series which closely matched. Although the original chronology is reasonably well correlated with 600 m temperatures at Alert (for JJA mean, <Emphasis Type="Italic">r</Emphasis>=0.41, significant at 0.01), the adjusted chronology is both better correlated and contains a more precise climate signal (<Emphasis Type="Italic">r</Emphasis>=0.54 for July mean, significant at 0.01). This is the first calibrated varve record produced from Arctic lake sediments, and demonstrates that varves from Lake C2 contain a paleoclimatic record. We believe the <Emphasis Type="Italic">post-facto</Emphasis> manipulations required to produce the adjusted varve chronology are reasonable given the uncertainties inherent in varve counting, and the lack of any independent corroborating chronostratigraphic markers.</Para></Abstract><KeywordGroup Language="En"><Heading>Key words</Heading><Keyword>varves</Keyword><Keyword>paleoclimate</Keyword><Keyword>climate</Keyword><Keyword>hydrology</Keyword><Keyword>Arctic</Keyword><Keyword>Ellesmere Island</Keyword></KeywordGroup><ArticleNote Type="Misc"><SimplePara>This is the ninth in a series of papers published in this issue on the Taconite Inlet Lakes Project. These papers were collected by Dr R. S. Bradley.</SimplePara></ArticleNote></ArticleHeader><NoBody></NoBody></Article></Issue></Volume></Journal></Publisher></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>The climatic signal in varved sediments from Lake C2, northern Ellesmere Island, Canada</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>The climatic signal in varved sediments from Lake C2, northern Ellesmere Island, Canada</title></titleInfo><name type="personal"><namePart type="given">Douglas</namePart><namePart type="given">R.</namePart><namePart type="family">Hardy</namePart><affiliation>Dept. of Geosciences, University of Massachusetts, 01003, Amherst, MA, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Raymond</namePart><namePart type="given">S.</namePart><namePart type="family">Bradley</namePart><affiliation>Dept. of Geosciences, University of Massachusetts, 01003, Amherst, MA, USA</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Bernd</namePart><namePart type="family">Zolitschka</namePart><affiliation>Geology Department, Trier University, Trier, Germany</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="OriginalPaper"></genre><originInfo><publisher>Kluwer Academic Publishers; http://www.wkap.nl/</publisher><place><placeTerm type="text">Dordrecht</placeTerm></place><dateCreated encoding="w3cdtf">1995-03-15</dateCreated><dateIssued encoding="w3cdtf">1996-09-01</dateIssued><copyrightDate encoding="w3cdtf">1996</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType></physicalDescription><abstract lang="en">Abstract: Annually-laminated clastic sediments preserve a high resolution proxy record of paleoclimate, provided that allochthonous sedimentation represents a response to meteorological forcing of watershed sediment transfer. Here, we demonstrate this linkage, and illustrate a calibration process using the most recent 40 years of a varve record from Lake C2 (82°50′ N; 78°00′ W), three years of field measurements, and meteorological data for 1951–92 from nearby AES weather station Alert. Field measurements were used to correlate proxies of the energy available for snowmelt (e.g. air temperature) and daily suspended sediment discharge (SSQ). Our calibration was extended through use of weather data from Alert. Both mean daily air temperature at Echo, and daily SSQ, were well correlated with air temperature at 600 m above Alert, as obtained from the 1200 Z (0800 LST) rawinsonde sounding. Accordingly, we used pooled 1990 and 1992 Alert 600 m data to predict the lagged daily sediment discharge into Lake C2 (adj. r 2=0.43). Daily values were summed each year in order to produce an annual series of predicted sediment transfer to the lake. The original varve chronology was based on eight sediment cores recovered from the deep basin of the lake (>80 m). Although low-frequency fluctuations of the varve and predicted SSQ series agree, slight tuning of the varve record optimizes the correlation between them. Adjustments were based on examination of weather data for specific years, reexamination of sediment core thin sections, and by aligning fluctuations in the two series which closely matched. Although the original chronology is reasonably well correlated with 600 m temperatures at Alert (for JJA mean, r=0.41, significant at 0.01), the adjusted chronology is both better correlated and contains a more precise climate signal (r=0.54 for July mean, significant at 0.01). This is the first calibrated varve record produced from Arctic lake sediments, and demonstrates that varves from Lake C2 contain a paleoclimatic record. We believe the post-facto manipulations required to produce the adjusted varve chronology are reasonable given the uncertainties inherent in varve counting, and the lack of any independent corroborating chronostratigraphic markers.</abstract><relatedItem type="host"><titleInfo><title>Journal of Paleolimnology</title></titleInfo><titleInfo type="abbreviated"><title>J Paleolimnol</title></titleInfo><genre type="journal" displayLabel="Archive Journal"></genre><originInfo><dateIssued encoding="w3cdtf">1996-09-01</dateIssued><copyrightDate encoding="w3cdtf">1996</copyrightDate></originInfo><subject><genre>Life Sciences</genre><topic>Geochemistry</topic><topic>Hydrogeology</topic><topic>Meteorology/Climatology</topic><topic>Sedimentology</topic><topic>Hydrobiology</topic></subject><identifier type="ISSN">0921-2728</identifier><identifier type="eISSN">1573-0417</identifier><identifier type="JournalID">10933</identifier><identifier type="IssueArticleCount">10</identifier><identifier type="VolumeIssueCount">3</identifier><part><date>1996</date><detail type="issue"><title>Taconite Inlet Lakes Project</title></detail><detail type="volume"><number>16</number><caption>vol.</caption></detail><detail type="issue"><number>2</number><caption>no.</caption></detail><extent unit="pages"><start>227</start><end>238</end></extent></part><recordInfo><recordOrigin>Kluwer Academic Publishers, 1996</recordOrigin></recordInfo></relatedItem><identifier type="istex">57693812323C50EF76A7F60F10AADD7808FCA715</identifier><identifier type="DOI">10.1007/BF00176938</identifier><identifier type="ArticleID">BF00176938</identifier><identifier type="ArticleID">Art9</identifier><accessCondition type="use and reproduction" contentType="copyright">Kluwer Academic Publishers, 1996</accessCondition><recordInfo><recordContentSource>SPRINGER</recordContentSource><recordOrigin>Kluwer Academic Publishers, 1996</recordOrigin></recordInfo></mods></metadata><serie></serie></istex></record>Pour manipuler ce document sous Unix (Dilib)
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